Thursday, April 22, 2010

Ketene derived from cold temperatures..

Meldrum acid break down when heated by the loss of acetone and carbon dioxide to form ketene, which has two lines of reactivity: on cyclobutanedione dimerization, or in the presence of an additional nucleophile to produce the corresponding esters or amides.

Researchers in the United States and Korea have shown how an unusual functional groups, which have been widely ignored in chemical materials, can be incorporated into the polymer to provide both grip rekatif to attach molecules - another molecule and a route to cross and connect the chain adjacent polymer.

The scientists showed that the various monomers, such as styrene, can be repaired with Meldrum acid, and after that dipolymerisasikan. This includes the spine into the Meldrum acid polymer when heated and some have diiproduksi ketene. In this way polymer terfungsionalisasikan with ketene group. this is very easy to adjust the amount of acid that contains some polymer Meldrum them. For example, we have made of polymers that contain 98 percent of polystyrene with only 2 percent Meldrum acid-containing reactive monomer, or 100 percent of monomer acids Meldrum.

Merger polymer chains can be cross-linked via ketene group, while leaving some remaining ketene which is available for further chemical material.

Meldrum acid break down when heated by the loss of acetone and carbon dioxide to form ketene, which has two lines of reactivity: on cyclobutanedione dimerization, or in the presence of an additional nucleophile to produce the corresponding esters or amides.

Researchers in the United States and Korea have shown how an unusual functional groups, which have been widely ignored in chemical materials, can be incorporated into the polymer to provide both grip rekatif to attach molecules - another molecule and a route to cross and connect the chain adjacent polymer.

The scientists showed that the various monomers, such as styrene, can be repaired with Meldrum acid, and after that dipolymerisasikan. This includes the spine into the Meldrum acid polymer when heated and some have diiproduksi ketene. In this way polymer terfungsionalisasikan with ketene group. this is very easy to adjust the amount of acid that contains some polymer Meldrum them. For example, we have made of polymers that contain 98 percent of polystyrene with only 2 percent Meldrum acid-containing reactive monomer, or 100 percent of monomer acids Meldrum.

Merger polymer chains can be cross-linked via ketene group, while leaving some remaining ketene which is available for further chemical material.

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